How to fix task manager memory column if it shows lies

Solution 1:

Check your Number format settings in control panel - regional options. The decimal symbol and the digit grouping symbol should be the different characters, e.g. . and ,. There are various glitches in some programs if they are the same.

Solution 2:

See this article What do the Task Manager memory columns mean?.

You need to choose in the View menu "Select columns", which columns to display.

You might have wanted to see Memory - Working Set:

Amount of memory in the private working set plus the amount of memory the process is using that can be shared by other processes.